Add CMake and pkgconfig configuration support on Install 

This patch adds three files: 

* CMakeLists.txt
* A CMake Config file for qhttpserver
* A pkgconfig file for qhttpserver

This is all done via CMake, but this could be changed if necessary in favour of manually configured files. 

This also adds support for travis-ci.org to build the project and test it (no tests are included..)